SAP provides SAP Java Connector in a number of different versions:
as a standalone software component that can be installed independently of the SAP system. You can access the installation files at service.sap.com/connectors. You can also use download sapjco.jar file and install it in your java application server, it doesn’t have to be NWDS, it can be any sever installed java application. Based on the server you can download different Jco jar.
The following example I finished on Windows32 operating systems. The instructions for the installation of SAP JCo on other operating systems are included in the corresponding download files.
Create a directory, for example C:\\SAPJCo, and extract the JCo .zip file I download from service markedt into this directory.
Copy the file librfc32.dll from my SAP JCo main directory to my PC C:\WINNT\SYSTEM32, as long as the version that is already there is not a more recent version than the one that is delivered with the SAP JCo. Make sure that the file sapjco.jar (in the SAP JCo main directory) is contained in the class path for all projects for which you want to use the SAP JCo. For productive operation, the following files from the SAP JCo .zip file are necessary: sapjco.jar,librfc32.dll,sapjcorfc.dll
Here is example I installed the Jco in NetBean and call SAP system.